package com.mygodp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisWorker {
    @Resource
    StringRedisTemplate stringRedisTemplate;


    /*开始时间戳*/
    private static final long BEGIN_TIMESTAMP=1640995200L;

    private static final int COUNT_BITS=32;

    public long nextId(String keyPrefix){
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;

        //2.生成序列号
        //2.1 获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:mm:dd"));
        //2.2 自增长
        long count = stringRedisTemplate.opsForValue().increment("icr" + keyPrefix + ":" + date);

        //3 拼接并返回
        return timeStamp<<COUNT_BITS | count;
    }
}
